Tadaaki Niwa (Graduate School of Engineering, Hokkaido University of Science, Japan)Takashi Kawakami (Faculty of Engineering, Hokkaido University of Science, Japan)Ryosuke Ooe (Faculty of Engineering, Hokkaido University of Science, Japan)Tamotsu Mitamura (Faculty of Future Design, Hokkaido University of Science, Japan)Masahiro Kinoshita (Faculty of Future Design, Hokkaido University of Science, Japan)Masaaki Wajima (Faculty of Engineering, Hokkaido University of Science, Japan)